The upgrade gear for the refractor is slowly coming together; the Hexfoc 10:1 gear set has been shipped from Teleskop-Express, and the Hotech Field Flattener is on the way from Agena Astro. I had to go with the Hotech after running into trouble trying to buy the Orion Flattener from Opt Corp - it seems Orion would not permit them to export it (so they say) and it would void the warranty, which is pretty disappointing when Orion's local distributor does not have any stock (I tried to buy local). Anyway the Hotech unit seems to be well regarded.
http://www.hotechusa.com/category-s/4.htm
I was only looking at those two as they best matched the backfocus distance (without additional extensions) of my camera and filter wheel combo. I should have these items towards the end of next week hopefully.